Bosk was a low-leveldemon and the leader of the Demonic Forty Thieves. He was known to be a very cruel demon. Bosk had hoped to find the lost city of Zanbar with the help of a genie named Jinny. However, his plans were thwarted when his genie sought the help of the Charmed Ones. He was vanquished by Jinny when she was freed from her bottle.

When Bosk attacked the manor on his flying carpet, Phoebe quickly wished Jinny free. It was then revealed that Jinny was actually an upper-level demon cursed into the bottle. She vanquished Bosk with a Fireball and escaped on his carpet.